LG Air Conditioner Error Code E450

E450 indicates a second confirmed detection of abnormally high temperature on the condenser coil. The system monitors condenser heat levels and, when it detects an unsafe temperature on two separate checks, it logs E450 and shuts down to prevent damage. This is a protective fault related to the outdoor heat exchanger and the components around it.

No, operating the unit while E450 is active is not safe. Sustained high condenser temperatures place severe stress on the compressor and refrigerant circuit components, and continued operation risks permanent compressor failure. The unit should remain off until the cause of the elevated temperature is identified and corrected.

Repair costs vary widely depending on the cause. A professional condenser coil cleaning might run between $75 and $200, while a condenser fan motor replacement typically falls in the $150 to $450 range including labor. Refrigerant-related repairs can range from $100 to $400 or more depending on the amount of refrigerant needed and local labor rates. A diagnostic service call alone generally costs between $60 and $120.

Some causes of E450 are DIY-accessible, such as cleaning a clogged condenser coil, removing debris blocking the outdoor unit, or clearing obstructions from the fan blade. However, issues involving refrigerant charge, motor replacement, or sensor diagnosis require proper tools and in some cases EPA certification for refrigerant handling. If basic cleaning does not resolve the fault, a licensed HVAC technician should perform further diagnosis.

A power reset may temporarily clear the E450 display, but because this is a second-detection fault, the underlying condition is unlikely to have resolved on its own. The code will almost certainly return once the unit restarts and the condenser temperature rises again. A reset should only be used as part of a diagnostic process after you have addressed a suspected cause, not as a standalone fix.